Improvement in seducing lead ores



G. F. CARPENTER. RRRRRRRRRRRRRRRR S.

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CHARLES F. CARPENTER, OF LOUISVI LLE,` KENTUCKY.

Letters Patent .Z Vo. 73,874, dated January 28, 1868.

IMPROVEMEN'I' IN REDUGING LEAD GRES.

tln ctzbuh temat tr in flgen rtta's irtmt na making part'mf tle sama ToALL -wHoM 11' MAY eoNoERNz Be it known that I, CHARLES F. Canruurnn, ofthe city of Lousville, in the'county of Jeft'erson, 'in the' StateofKentucky, have in"ented a new and improved Mode of Treeting LeadOres,for the pnrpOSe-OfoXidizing and desulphurizing them, and obtainingftomzthem metallic lead; and I do hereby declare that the following is afull and exactdescription thereof, reference being had to theaccompanying dra\vings,`and to the letters of reference marked thereon.t :I .w 7 i I The nature of my invention consists in i utroducinglatmospheric air and steam, together or separatcly, into a reverberatoryfurnace, directly between the flame und the ores oflcad which li'eupouthe hearthiof the furnace. To accomplish this I conduct the ai;l andsteamthrough therfiro-hridge, which, when red hot, gives the air andsteam a high temperature, and cauos f'tbem to'l act with great energyupon the heatcd orstof lead, and thus hastening the production ofmetollie lead. j

To enable others to use my invention, I will `proceed to dscribe itsoperation.

In the ordinary treatment of galena to produc 1 metallic lead in, areverheratory furnace, the usual method is to open the side doors of thefurnace, (which are marked D D lin the drawing,) during the first stagosof the process, thus'allwing atmospheric air to enter the furnace, andconvert the sulphides of lead into oxide and sulphate of lead. h Thedoors arethen closed, the heat raised, the oxides act upon thesu'lphates, sulphurous acid is fornied,passcs ofl`, vand -leaves thelead in a metnllic state. To hasten this process of comterting thesulphides of lead into oxides and sulphates of lead, I introd'uccatmospheric air and steamidirectly between thefiame and the ores, thatis, into the 'space markcd B in t'ne aceompanying drawing; consequentlya powerfully-oxidizing stratum of air and steam constantly passes di!eetly over' the whole surface of, the heated'ores, from one end of thefurnace to the other. The mode by which I introduce atmospheric air intothis space max-kod B, is by a. main channelhA, and smaller channels a aa 'z a, formed in the fire-bridge. Ths'bridge, when red hot, intenselyheats the' air passing through it, and eo'nsequently it acts' withgrcat'cnergy upon the said ores. I introduce steam through pipes in thefire-bridge, (ma'z'ked b b 6 b bin the drawing.) These pipes, whenredhot', raise the' steam to a high temperature, hy which its action onthe ores is increased. By this steam, the temperature of the'furuacc isrcadily controlled, and a greater or' less amount of air made to pass byinduction through the channels a a a a a.

What I ola-im as my invention, and desire to secure by' Letters Patent,is-- w v The introductiou of atmospheric air and steam, together orseparately,'directly into the space marked B, in a reverbcratoryfurnace, so that they may pass directly 'between the flame andthe orcsof lead upon the liearth.

I also claim introducing air and steam through the fire-bridge, so thatthey may be intensely heat'ed before acting on said ores, as hereindescribed, or any other method substantially the same.

The above specification of my invention, sigued by mc, this 5th day ofAugust, A.'D. 1867.

OHAs. F. CARPENTER.

Witnesses:

R. T. STONE, F. SrxseELnALDnn.

